Hello there fellas,
I'm going to discuss something that keeps making me nervous. I'm that kind of a person who likes the decentralization, the privacy, the freedom and the equality in the financial world. It comes to my mind that these exchangers might someday be selfish, crypto is getting worthy and it will bring the eyes of the greedy peoples. Imagine that these exchangers grabs the trust of the peoples and then they start manipulating the market. The total volume in the exchangers is not stabe and peoples will never withdraw all their funds. Let's say that the amount of the holdings that an exchange have is 1000 btc, they could easily create sell walls of 1500 btc and peoples will buy because they trust these exchangers. What will happen then? Imagine that all the exchangers do this, what's your thoughts on this fact?.
This is why we should not be blindly trusting in exchanges.
Exchanges don't even need customer capital to manipulate any side of the orderbook they want once they gain enough of a following. After all, they have full control over their own trading engines as well as the orders listed on their books. If they have sufficient influence their manipulation can flow onto the rest of the market through indices that contain their price info, etc.
Also, wash trading is another very common occurrance in the crypto scene. I wouldn't doubt if the majority of unregulated exchanges do it in order to fake their volumes.
Even regulated exchanges probably dabble in shady stuff every now and then. There is now guarantees. This is why DEXs are going to be awesome, but for now, just beware of obvious exchange manipulation.